Soda-lye evaporator.



G. P. CARLSON, DEGD.

I GAELSON EXECUTBIX. SODA LYE EVAPOBATOE.

APPLIOATIQK FILED JUNE 6, 1907.

Patented July 12, 1910.

2 SHEETS-SHEET 1.

G. P. GARLSON, DEGD.

n. GABLSON, sxncwmlx. SODA LYE EVAPORATOB.

v APPLICATION nun Jun: 6, 1907.

Pgtented July 12, 1910 2 BIEIIBTS-SHIIET 2.

UNITED: STATES PATENT OFFICE.

CARL PETER CARLSUN, OF LANGBRON, DINGELVIK, SWEDEN; EBBA CARL-SON,EXECU- TBIX 01E SAID CARL PETER CARLSON, DECEASED. ASSIGNOR CF ONE-HALFIO JOSEPH H. WALLACE & COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK.

SODA-LYE EVAPORATOR.

v Specification of Letters Patent.

Patented 5 uly 12, 1910.

To all whom it may concern:

Be it known that I, CARL PETER Causes, :1 subject at thcfliiug ofSweden, and resident of Langbron, Dingc-lvilr, in the Kingdom of Sweden,have invented certain new and useful Improvements in Soda-Lye llvaporators, of which the following is a specification. reference beingbad therein to the accompanying drawings.

This invention relates to such apparatus for the evaporating andconcentrating of the spent lye in'soda-pulp works, in which rotatingballlc wheels are employed, the plates of which are dipped into the lye,contained in a tank, so that the lye, adhering to the plates, is carriedwith same upward above the liquid surface and is brought in contact withhot gases passing from a furnace, where resinous Substances etc. in theconcentrated lye are burned. and s concentrated by the evaporation thusutter-ted. It has been found that bubbles from the. concentrated sodalye are ca'ried with "the said gases, said bubbles tcniing dust,escaping with the gases. For that reason it has been proposed to arrangthe battle plates of the wheels at right. angles to the rotary axis ofthe wheel and in zigzag order, so that not only the gases come in closecontact with the lye solution adhering to the plates but also the saidsoda dust necessarily strikes one of the plates and is caught by thesame, thus being saved.

With the construction of the battle wheels hitherto used, they do notaffect the circulation of the lye. necessary especially for theconcentration of a lye rich in resinous substances. For that reason theobject of this invention is to so arrange the wheels, that apparatuswith its cover removed. Fig. 4 s ows one of the wheels developed.

In a closed tank 1 for the lye two bathe wheels 3, 4. carried by shaftsand 6 respectivel are mounted on each side of a longitudinal centralpartition wall 2. The said shafts are mounted in bearings 7 carried bycross beams 8, and are rotated by a shaft 11 by means of. gears 9, 10.The said rains being thereby made practical in every Z resp set,

In the accompanying drawings Figure 1 taken on the line 2-42 of Fig. l,but the shafts with their hearings and the g ars which are mounted uponthe ends of the shafts are not. shown in section. Fig. 3 is an oafliewheels consist of arms 1? extending from hubs 12 and connected by rings14 concentric with the shaft, and of rods 15 parallel to the shaft andfixed in the rings or the arms. which rods carry the plates or wings 16.The wheels shown in the drawings are made in three sections. When thewheels are rotated, the battle plates are dipped into the lye containedin the tank, which lye does not fully come up to the shafts .3, ti.During the said rotation the lye adheres to the plates and follows thesame upward. Hot gases generated in the soda. furnace enter the tankthrough a channel 1? pass between the plates 16 and escape through achannel 18 leading to a fan or a chimney. Owing to the zigzag order ofthe plates, Fig. 4, the gases, when passing through the tank, come inclose contact with the lye, carried with the plates. a rapid a'ndefficacious evaporation being thereby elfected. Owing to theirposit-ionthe plates prevent soda particles carrio l by the gases frompassing through the apparatus, the said particles being on the contrarycaught by theplates and transported downward into the. lye. In order toprevent the gases from passing through the space between the plate setof each section of the wheels. each hub 12 is provided with a flange 12extending around the hub and outward to the inner MEAN fithe plates.

According to this invention the plates 16 are mounted in an obliquedirection to the rotary axes of the shafts, and so, that thc plates ofeach wheel form screw threads. Owing to this arrangement the plates,when the wheel is rotated, will feed the lye longitudinally to theshafts 5 and 6 respectively. Besides. the plates of the \Yhccls are somounted or the wheels rotated in such direction, that one wheel. 5".HHH'UH the lye in one direction. \lZ., toward lhc right. soc Fig.

and view and partly a crossscctioii of the 2, and the other when] i inthe oppo ite ti rection.

artition wall is provided. At this end the ye passes from the wheel 3 tothe wheel 4-. At the end of the tank the partition wall is made somewhatlower so that the lye may Q be moved over it by the heel 4. the lye abeing circulated in this manner. In order vto facilitate the moving ofthe lye across this part of the partition wall the left section of thewheel 4, Fi is provided with 1 suitable number of plates 16 parallel tol the shaft of the wheel. The lye enters the tank through an opening 11)and leaves the around the apparatus. Consequently. by my invention theadvantage. is gained, that the wheels put the lye in the necessarycirculation in the apparatus, at the same time the wheels effect a closecontact between the gases and the lye adherin; to the plates and thecatching of soda dust, carried with the gases.

Having now described my invention. what- I claim as new and desire tosecure by Letters Patent is: i

1. The combination with a tank arranged to permit the passagetherethrough of gases containing soda dust and adapted to contain sodalye, of a longitudinal partition wall cut through at its ends. androtatable bafile wheels on each side of the said wall, the plates ofwhich are mounted in an oblique position to the rotary axis of the wheeso that the wheels cause the lye to circulate in the tank.

2. The combination with a reservoir adaptedto contain a lye solution andhaving: an inlet and an outlet for said solution and arranged to providefor the passage of gases containing soda ash dust through said reservoirover said solution, and a plurality of rotatable frames bearingbattle-plates contained in said reservoir and arranged therein toprovide a continuous but tortuous passage throughout the length of thereservoir along which the lye solution is caused to travel.

3. The combination with a reservoir adapted to contain a lye solutionand having an inlet and an outlet. for said solution and arranged toprovide for the. passage of the gases containing soda-ash dust throughsaid reservoir over said solution, a plurality of rotatable framescontained in said reservoir and arranged transversely with respectthereto, and several rows of battle-plates borne by each frame, thebattle-plates of each row being arranged obliquely to the At the rightend of the tank. no t axis thereof, of the frame bearing them.substantially as described.

4. The combimttion with a reservoir adapted to contain a lye solutionand having an inlet and an outlet for said solution and arranged toprovide for the passage of ga-cs containing soda-a h dust through saidreservoir, over said solution. a plurality of rotatable frames containedin said l' -heI'YHil and arranged transversely with respect theretoseveral rows of o liquely dispos d batllcplates borne by each frame. thebattle-plat s of alternate frames extending in opposite 'ays totorluously circulate the lye solution throughout the reservoir,substantially as described.

5. The combination with a re ervoir adapted to contain a lye solutionand having an inlet and an outlet for said s lution and arranged to prmidc for the passage of gases containing sodaash dust through said resrvoir over said solution. and a plurality of rotatable frames containedin said ieservoir and arranged transversely with respect. thereto, eachcomprising cross-bars arranged in parallel with its axis and endsupport; therefor, and battle-plates arranged in rows on saidcross-bars. obliquely to the axis of the. frame. the battle-plates ofeach row being arranged opposite the spaces, between the lmtlleplates onthe next row, substantially as described.

6. The combination with a reservoir adapted to contain a lye solutiozand having an inlet and an outlet for said solution and arranged toprovide for the passage of gases containing; soda-ash dust through saidreservoir, over said solution. and a plurality of rotatable framescontained in said reservoir and arranged transversely with respectthereto. each comprising cross-bars arranged in parallel with its axisand end supports therefor. and radially disposed battlwp ates supportedat each end upon a pair of crossbars, the pair of Crossbars supportinpeach row of battle-plates also supporting the adjacent sides of theadjacent rows of battleplates, which are staggered with rcspccL thereto,substantially as described.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

(JARL PETER CARLSON.-

W'itnesses: Romarr APELGREN, Gusrar IsrA'i'r.

